US4614171A - Rocker arm construction - Google Patents

Rocker arm construction Download PDF

Info

Publication number
US4614171A
US4614171A US06/751,965 US75196585A US4614171A US 4614171 A US4614171 A US 4614171A US 75196585 A US75196585 A US 75196585A US 4614171 A US4614171 A US 4614171A
Authority
US
United States
Prior art keywords
rocker arm
cam
shaft
cam roller
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/751,965
Inventor
Shashi Malhotra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
W H INDUSTRIES Inc A CORP OF DE
W H IND Inc
Original Assignee
W H IND Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W H IND Inc filed Critical W H IND Inc
Priority to US06/751,965 priority Critical patent/US4614171A/en
Assigned to W H INDUSTRIES INC., A CORP OF DE. reassignment W H INDUSTRIES INC., A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MALHOTRA, SHASHI
Application granted granted Critical
Publication of US4614171A publication Critical patent/US4614171A/en
Assigned to DOCUMENTATION ON SUPPORT GROUP reassignment DOCUMENTATION ON SUPPORT GROUP SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WH INDUSTRIES, INC.
Assigned to FINOVA CAPITAL CORPORATION reassignment FINOVA CAPITAL CORPORATION SECURITY AGREEMENT Assignors: WH INDUSTRIES INC.
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L1/185Overhead end-pivot rocking arms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00Valve arrangements comprising rollers
    • F01L2305/02Mounting of rollers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2810/00Arrangements solving specific problems in relation with valve gears
    • F01L2810/02Lubrication

Abstract

An improved rocker arm for an internal combustion overhead cam engine, the rocker arm having a cam roller journaled therein on needle bearings and the like, and being so constructed to provide a reservoir for oil to insure continued lubrication of the cam roller.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to improvements in the construction of rocker arms as used in overhead cam shaft internal combustion engines of modern automobiles. In these applications cam actuated rocker arms engage the valve stems of the intake and exhaust valves and effect reciprocating motion of the stems, thus opening and closing the valves in predetermined sequence.
Rocker arms of the general type being described herein are constructed with a cam roller rotatably mounted on a shaft supported by side walls of the rocker arms and in a slot-like, bottomless and topless opening in the rocker arm. Lubrication of the cam roller is effected by oil splashing therein in a haphazard manner. Premature failure of the cam roller and thus the rocker arm can result from the lack of lubrication, causing malfunction of the valving and requiring replacement of the rocker arm assembly.
2. Description of Prior Art
Spencer, U.S. Pat. No. 2,385,309, describes a valve actuating mechanism in an overhead cam environment which comprises a rocker arm, supported on a pivot pin, having a cam roller recess in its upper part in which a cam roller is rotatably seated. The rocker arm is constructed with various passages for forced lubrication of the cam roller and the valve stem, oil being supplied through the pivot pin to and through the various passages, making the rocker arm very expensive to manufacture. The passages can become clogged in the event of contamination of the oil supply, requiring removal and cleaning and perhaps replacement of the rocker arm.
Sampietro, U.S. Pat. No. 3,139,870, shows an operating arrangement for the valves of cylinders of an internal combustion engine. Each cylinder has four valves and each valve is actuated by a rocker arm; there are at least two types of rocker arms used. One type has a cam roller journaled at its end; the other type has a cam roller journaled centrally thereof. Both rollers engage the same cam. The patent is silent as to the lubrication of the cam rollers.
SUMMARY OF THE INVENTION
According to the invention herein described, an improved rocker arm is provided for an overhead cam internal combustion engine. The improved rocker arm can be described as being shaped like a canoe or bathtub, i.e., one which is elongated with defining side and end walls, a bottom wall and an open top. A cam roller is journaled on a shaft supported by the side walls such that a part of the roller extends above the tops of the rocker arm's defining walls. The rocker arm is pivotably supported at one end on a generally vertical adjustable valve or valve clearance lash member and engages a valve stem at its other end. The lash adjuster is formed with a generally spherical top which is received in a generally spherical shaped socket formed in the rocker arm. The rocker arm has a flat engaging the valve stem. The valve stem is resiliently urged upwardly by means of a coil spring to maintain its engagement with the flat of the rocker arm.
The cam roller engages a cam on the cam shaft of the engine, usually driven at half speed of the crank shaft through gearing, a chain-sprocket arrangement or through a belt-pulley arrangement. Each cylinder of the engine has at least two valves, an intake valve and an exhaust valve, and each is actuated by a cam-actuated rocker arm in a predetermined sequence. Because the operation of the engine valves are well known in the art, it will not be further described.
Each cam roller of this invention is provided with anti-friction means, preferably in the form of needle bearings surrounding its shaft; however, other types of anti-friction means can be used, such as "Teflon" cloth, lining the roller.
The rocker arms, because of their construction act as reservoirs for oil and insure the continued lubrication of the cam rollers, the anti-friction means and insure long operating life to the assembly of cam rollers and rocker arms.
An opening can be formed in the bottom of the rocker arm for oil to pass onto the associated valve stem; however, the position of the opening is chosen such that the oil level in the rocker arm will be sufficient to insure continued lubrication of the cam roller and its anti-friction means.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective illustration of the construction of the rocker arm and cam roller assembly of this invention;
FIG. 2 is a cross-sectional view taken on line 2--2 of FIG. 1; and
FIG. 3 is a longitudinal cross-sectional view of the rocker arm and cam roller assembly of this invention showing schematically the environment in which the rocker arm and cam roller assembly is used.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Looking now at the drawings, the rocker arm of this invention is elongated and identified as 10, and comprises side walls 12 and 14, end walls 16 and 18, and a bottom wall 20. The rocker arm resembles a canoe or bathtub because of its shape and its open top. A cam roller 22 is journaled in the rocker arm 10 on needle bearings 24 by shaft 26, the latter being supported by the side walls 12 and 14. Thrust washers 28 flank the sides of the roller 22 to absorb any side-wise thrust encountered. One end 30 of the rocker arm 10 is provided with a spherical socket 32 which receives a complementary-shaped end 34 of a height adjustable lash adjuster 36 (see FIG. 3). The other end 38 of the rocker arm 10 is provided with a flat 40 to engage the top of a valve stem 42, the valve stem being resiliently urged upwardly into engagement with the flat by a coil spring 44. The cam roller 22 engages a cam 46 fixed on a rotatable cam shaft 48. As the cam shaft rotates, the cam also rotates and when the elongated cam part 50 contacts the cam roller, the rocker arm is caused to pivot at the socket 32, which in turn moves the valve stem 42 downwardly against the spring 44, thus opening the valve V. As will be understood, as the cam shaft rotates, the cams, usually two for each cylinder, sequentially open and close the valves of the engine, permitting the flow of fuel into and the exhaust of products of combustion from the cylinders.
The particular construction of the rocker arm permits it to retain oil; the construction permits the rocker arm to function as a reservoir for oil, insuring continued lubrication of the cam rollers. Generally sufficient oil is provided by oil; splashing from the engine crankcase; however, an initial supply of oil can be provided and replenished periodically if necessary.
As shown in FIG. 3, a passage 52 can be provided in the bottom of the rocker arm for oil to be supplied to the valve stem. The location of the passage 52 is such that the oil level in the reservoir is sufficient to insure continued lubrication of the cam roller journal.
The rocker arm is generally a metal stamping and is thus economical to manufacture; the cam roller is generally a machined metal part.
The appended claims are intended to cover all reasonable equivalents of the structure.

Claims (6)

I claim:
1. A rocker arm for an internal combustion engine, said rocker arm mounting thereon a concentrically mounted cam roller engaging and rotating with a cam on the rotatable cam shaft of the engine, said rocker arm being elongated and having side and end walls and a bottom wall, and comprising an open, generally flat-topped tub-like container, one end of said rocker arm being provided with a generally concave semi-spherical depression, so as to be supported on a complementary shaped semi-spherical member at a fixed height, and the other end of which engages the stem of a valve of said engine, said rocker arm being pivotable about its fixed height end by means of said cam engaging the cam roller to thus operate the valve, said rocker arm functioning as a reservoir for oil in which said cam roller rotates, said cam roller being rotatably mounted on a roller shaft journaled in circular openings in the side walls of said rocker arm and having anti-friction means comprising needle bearings surrounding its supporting shaft.
2. In an internal combustion engine having a cylinder head and combustion chambers, an input port and an exhaust port opening into each chamber, a spring loaded poppet valve controlling the flow of gas to and from each combustion chamber, a cam being so constructed and arranged to operate each valve in a predetermined sequence, a cam shaft driven from said engine and having cams mounted thereon, a concentrically mounted cam roller engaged by its respective cam, each cam roller being rotatably mounted in a rocker arm, each rocker arm being tub-like and having a body portion and a pair of extending portions defining a generally flat top container, circular openings in said rocker arm providing journals for said cam roller shaft, means supporting one of said extending portions at a fixed location, said means comprising a generally semi-spherical member engaging a complementary depression in said rocker arm, the other extending portion engaging the stem of a poppet valve, whereby each cam engaging its cam roller operates a valve in a predetermined sequence, said rocker arm being so constructed and arranged to function as a reservoir for oil such that said cam roller rotates in a bath of oil.
3. In an internal combustion engine as recited in claim 2, further comprising a passageway in one extending portion of said rocker arm for the passage of oil onto its valve stem.
4. A rocker arm assembly for an internal combustion engine and a mounting for said assembly which comprises:
a substantially vertical shaft terminating in a generally semi-spherical shaft member;
a rocker arm having a body portion and protruding arms, one arm of which is provided with a depression complementary shaped to said shaft member so as to support said rocker arm at one end while permitting pivoting movement of said rocker arm about said shaft member, the other arm of said rocker arm contacting and activating a valve stem;
means resiliently urging said valve stem toward said rocker arm;
a tub-like chamber formed by the body and arms of said rocker arm;
a cam roller concentrically mounted on anti-friction means, supported on a shaft journaled in said body portion and located in said chamber, said shaft traversing said chamber;
a cam engaging said roller and causing said pivotable movement of the rocker arm in relation to said vertical shaft and said shaft member to thus activate said valve stem.
5. A rocker arm assembly as recited in claim 4, further comprising an opening in said body portion, said opening being so constructed and arranged to supply oil from said reservoir to said valve stem.
6. A rocker arm assembly as recited in claim 4, wherein said anti-friction means comprises needle bearings.
US06/751,965 1985-07-05 1985-07-05 Rocker arm construction Expired - Fee Related US4614171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/751,965 US4614171A (en) 1985-07-05 1985-07-05 Rocker arm construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/751,965 US4614171A (en) 1985-07-05 1985-07-05 Rocker arm construction

Publications (1)

Publication Number Publication Date
US4614171A true US4614171A (en) 1986-09-30

Family

ID=25024270

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/751,965 Expired - Fee Related US4614171A (en) 1985-07-05 1985-07-05 Rocker arm construction

Country Status (1)

Country Link
US (1) US4614171A (en)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0267696A1 (en) * 1986-10-15 1988-05-18 Honda Giken Kogyo Kabushiki Kaisha Valve operating apparatus in an internal combustion engine
US4791893A (en) * 1986-07-11 1988-12-20 Nissan Motor Co., Ltd. Valve train arrangement for multi-valve engine
US4796483A (en) * 1987-09-11 1989-01-10 The Henley Group, Inc. Cold-formed rocker arm with cam-contacting roller
US4825822A (en) * 1985-08-29 1989-05-02 Nissan Motor Co., Ltd. Rocker arm arrangement for multi-valve internal combustion engine
US4848180A (en) * 1988-09-06 1989-07-18 Henley Manufacturing Corporation Low-friction, boat-type rocker arm
US4856466A (en) * 1988-09-28 1989-08-15 Ford Motor Company Lubricant retaining finger-follower rocker arm
US4995281A (en) * 1989-07-31 1991-02-26 Ford Motor Company Lightweight rocker arm
US5010856A (en) * 1990-10-15 1991-04-30 Ford Motor Company Engine finger follower type rocker arm assembly
US5016582A (en) * 1990-10-12 1991-05-21 Henley Manufacturing Holding Company, Inc. Rocker arm
US5063889A (en) * 1990-08-24 1991-11-12 Henley Manufacturing Holding Company, Inc. Rocker arm with lubrication provisions
US5372097A (en) * 1992-12-18 1994-12-13 Welles Manufacturing Self-lubricating cam follower
WO1997019258A1 (en) * 1995-11-23 1997-05-29 INA Wälzlager Schaeffler oHG Driving lever or rocker arm made by non-cutting shaping
DE19645789A1 (en) * 1996-11-07 1998-05-14 Schaeffler Waelzlager Ohg Rocking lever for valve gear of internal combustion engine for vehicle
US5819694A (en) * 1997-05-15 1998-10-13 Welles Manufacturing Company Stamped roller-type cam followers with added height
US5887474A (en) * 1997-03-20 1999-03-30 E & E Manufacturing Company, Inc. Method for manufacturing a rocker arm
US5983848A (en) * 1995-09-08 1999-11-16 Calka; Andrzej Finger follower
DE19833112A1 (en) * 1998-07-23 2000-01-27 Schaeffler Waelzlager Ohg Lever-type cam follower of valve gear of internal combustion engine activates at least one gas exchange valve and comprises two longitudinally extending side walls joined to each other by cross beam
US6425361B1 (en) 1999-05-31 2002-07-30 Koyo Seiko Co., Ltd. Rocker arm and method of fabricating rocker arm body
EP1258600A1 (en) * 2001-05-17 2002-11-20 Isuzu Motors Limited Rocker arm for internal combustion engine
US6523514B1 (en) * 1999-08-18 2003-02-25 Koyo Seiko Co., Ltd. Rocker arm and method of manufacturing rocker arm body
US6672266B2 (en) * 1998-03-12 2004-01-06 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
US20050028774A1 (en) * 2003-08-06 2005-02-10 The Torrington Company Finger follower
EP1637705A1 (en) * 2003-06-06 2006-03-22 NSK Ltd. Rocker arm and method of producing the arm
FR2878282A1 (en) * 2004-11-22 2006-05-26 Renault Sas Internal combustion engine`s valve activating pawl, has one end with tank for channeling oil and drain hole in base of tank being positioned opposite to free end of valve shaft when valve is in rest, where free end has oil retention cavity
DE102005059027A1 (en) * 2005-12-10 2007-06-14 Schaeffler Kg Lever-type cam follower for valve drive of internal combustion engine, has lubricant slot that runs out from upper side to inner side of side wall and runs in area of transverse plane of follower, where plane coaxially intersects roller
US20090173300A1 (en) * 2006-03-31 2009-07-09 Nsk Ltd. Cam follower device
US20110132304A1 (en) * 2008-08-21 2011-06-09 Ntn Corporation Cam follower for rocker arm and cam follower device
EP2947285A1 (en) * 2014-05-22 2015-11-25 Aktiebolaget SKF Mechanical system forming a cam follower or a rocker arm, including an inner cavity adapted to contain an oil bath

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699659A (en) * 1927-09-30 1929-01-22 John T Fagan Rocker arm and rocker-arm shaft
US2041983A (en) * 1933-04-24 1936-05-26 Packard Motor Car Co Internal combustion engine
US2071051A (en) * 1934-03-30 1937-02-16 Packard Motor Car Co Internal combustion engine
US2322174A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322173A (en) * 1941-12-24 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322172A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2385309A (en) * 1944-09-18 1945-09-18 Spencer Aircraft Motors Inc Valve actuating mechanism
US2435727A (en) * 1946-05-10 1948-02-10 Spencer Aircraft Motors Inc Valve actuating mechanism
US2905161A (en) * 1958-04-14 1959-09-22 Chrysler Corp Rocker arm
US2917033A (en) * 1958-01-27 1959-12-15 Parsons Corp Rocker arm and process of manufacturing the same
US3139870A (en) * 1962-01-03 1964-07-07 Sampietro Achille Carlo Internal combustion engines with four valves

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699659A (en) * 1927-09-30 1929-01-22 John T Fagan Rocker arm and rocker-arm shaft
US2041983A (en) * 1933-04-24 1936-05-26 Packard Motor Car Co Internal combustion engine
US2071051A (en) * 1934-03-30 1937-02-16 Packard Motor Car Co Internal combustion engine
US2322174A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322172A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322173A (en) * 1941-12-24 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2385309A (en) * 1944-09-18 1945-09-18 Spencer Aircraft Motors Inc Valve actuating mechanism
US2435727A (en) * 1946-05-10 1948-02-10 Spencer Aircraft Motors Inc Valve actuating mechanism
US2917033A (en) * 1958-01-27 1959-12-15 Parsons Corp Rocker arm and process of manufacturing the same
US2905161A (en) * 1958-04-14 1959-09-22 Chrysler Corp Rocker arm
US3139870A (en) * 1962-01-03 1964-07-07 Sampietro Achille Carlo Internal combustion engines with four valves

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825822A (en) * 1985-08-29 1989-05-02 Nissan Motor Co., Ltd. Rocker arm arrangement for multi-valve internal combustion engine
US4791893A (en) * 1986-07-11 1988-12-20 Nissan Motor Co., Ltd. Valve train arrangement for multi-valve engine
EP0267696A1 (en) * 1986-10-15 1988-05-18 Honda Giken Kogyo Kabushiki Kaisha Valve operating apparatus in an internal combustion engine
US4796483A (en) * 1987-09-11 1989-01-10 The Henley Group, Inc. Cold-formed rocker arm with cam-contacting roller
US4848180A (en) * 1988-09-06 1989-07-18 Henley Manufacturing Corporation Low-friction, boat-type rocker arm
US4856466A (en) * 1988-09-28 1989-08-15 Ford Motor Company Lubricant retaining finger-follower rocker arm
US4995281A (en) * 1989-07-31 1991-02-26 Ford Motor Company Lightweight rocker arm
US5063889A (en) * 1990-08-24 1991-11-12 Henley Manufacturing Holding Company, Inc. Rocker arm with lubrication provisions
US5016582A (en) * 1990-10-12 1991-05-21 Henley Manufacturing Holding Company, Inc. Rocker arm
US5010856A (en) * 1990-10-15 1991-04-30 Ford Motor Company Engine finger follower type rocker arm assembly
US5372097A (en) * 1992-12-18 1994-12-13 Welles Manufacturing Self-lubricating cam follower
US5983848A (en) * 1995-09-08 1999-11-16 Calka; Andrzej Finger follower
US6035820A (en) * 1995-11-23 2000-03-14 Ina Walzlager Schaeffler Ohg Rocker arm or finger lever formed by a chipless process
WO1997019258A1 (en) * 1995-11-23 1997-05-29 INA Wälzlager Schaeffler oHG Driving lever or rocker arm made by non-cutting shaping
US6062184A (en) * 1995-11-23 2000-05-16 Ina Walzlager Schaeffler Ohg Rocker arm or finger lever formed by a chipless process
DE19645789B4 (en) * 1996-11-07 2006-09-21 Schaeffler Kg Drag lever for a valve train of an internal combustion engine
DE19645789A1 (en) * 1996-11-07 1998-05-14 Schaeffler Waelzlager Ohg Rocking lever for valve gear of internal combustion engine for vehicle
US5887474A (en) * 1997-03-20 1999-03-30 E & E Manufacturing Company, Inc. Method for manufacturing a rocker arm
US5819694A (en) * 1997-05-15 1998-10-13 Welles Manufacturing Company Stamped roller-type cam followers with added height
US6672266B2 (en) * 1998-03-12 2004-01-06 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
DE19833112A1 (en) * 1998-07-23 2000-01-27 Schaeffler Waelzlager Ohg Lever-type cam follower of valve gear of internal combustion engine activates at least one gas exchange valve and comprises two longitudinally extending side walls joined to each other by cross beam
US6182626B1 (en) 1998-07-23 2001-02-06 INA Wälzlager Schaeffler oHG Lever-type cam follower for a valve drive of an internal combustion engine
US6425361B1 (en) 1999-05-31 2002-07-30 Koyo Seiko Co., Ltd. Rocker arm and method of fabricating rocker arm body
US6523514B1 (en) * 1999-08-18 2003-02-25 Koyo Seiko Co., Ltd. Rocker arm and method of manufacturing rocker arm body
EP1258600A1 (en) * 2001-05-17 2002-11-20 Isuzu Motors Limited Rocker arm for internal combustion engine
US6679210B2 (en) 2001-05-17 2004-01-20 Isuzu Motors Limited Rocker arm for internal combustion engine
EP1637705A1 (en) * 2003-06-06 2006-03-22 NSK Ltd. Rocker arm and method of producing the arm
EP1637705A4 (en) * 2003-06-06 2009-11-04 Nsk Ltd Rocker arm and method of producing the arm
US20050028774A1 (en) * 2003-08-06 2005-02-10 The Torrington Company Finger follower
FR2878282A1 (en) * 2004-11-22 2006-05-26 Renault Sas Internal combustion engine`s valve activating pawl, has one end with tank for channeling oil and drain hole in base of tank being positioned opposite to free end of valve shaft when valve is in rest, where free end has oil retention cavity
DE102005059027A1 (en) * 2005-12-10 2007-06-14 Schaeffler Kg Lever-type cam follower for valve drive of internal combustion engine, has lubricant slot that runs out from upper side to inner side of side wall and runs in area of transverse plane of follower, where plane coaxially intersects roller
US20090173300A1 (en) * 2006-03-31 2009-07-09 Nsk Ltd. Cam follower device
US20110132304A1 (en) * 2008-08-21 2011-06-09 Ntn Corporation Cam follower for rocker arm and cam follower device
US9500269B2 (en) 2008-08-21 2016-11-22 Ntn Corporation Cam follower for rocker arm and cam follower device
EP2947285A1 (en) * 2014-05-22 2015-11-25 Aktiebolaget SKF Mechanical system forming a cam follower or a rocker arm, including an inner cavity adapted to contain an oil bath
CN105089730A (en) * 2014-05-22 2015-11-25 Skf公司 Mechanical system forming a cam follower or a rocker arm, including an inner cavity adapted to contain an oil bath
US9441722B2 (en) 2014-05-22 2016-09-13 Aktiebolaget Skf Mechanical system forming a cam follower or a rocker arm, including an inner cavity adapted to contain an oil bath
CN105089730B (en) * 2014-05-22 2019-12-10 Skf公司 Mechanical system forming a cam follower or rocker arm and comprising an internal cavity

Similar Documents

Publication Publication Date Title
US4151817A (en) Engine valve control mechanism
US6328009B1 (en) Valve lifter apparatus
EP0275715B1 (en) Hydraulic circuit of a valve operating timing control device in an internal combustion engine
US6612275B2 (en) Mid cam engine
US7243632B2 (en) Small four-stroke gasoline engine with oil mist lubrication
US4729349A (en) Oil supply system for a valve operating mechanism in internal combustion engines
JP3989867B2 (en) Valve operating device for internal combustion engine
US7185615B2 (en) Variable stroke engine
US6357405B1 (en) Valve drive mechanism of four-stroke cycle engine
US5709185A (en) Lubricating system for four-stroke-cycle engine
KR0158900B1 (en) Internal combustion engine for a vehicle
US4773361A (en) Overhead cam type four-valve actuating apparatus for internal combustion engine
JPH087043Y2 (en) Lubricator for double overhead cam type valve mechanism
US4825717A (en) Rocker arm of the cam-follower type with ribs
US4688529A (en) Lubricating system for horizontal cylinder overhead valve engine
KR920000787B1 (en) Valve arm chamber apparatus for diesel engine
US4790273A (en) Vertical engine for walk behind lawn mower
US4811704A (en) Valve stem seal
CA1233714A (en) Integral rocker arm hydraulic lifter and bearing assembly
US4527518A (en) Internal combustion engine having single overhead camshaft
US4708102A (en) Roller cam follower with positive lubrication
US3509858A (en) Overhead cam valve lifter
US3108580A (en) Non-rotatable valve tappet
US4697473A (en) Rocker arm with cam-contacting roller
US4607599A (en) Roller follower hydraulic tappet

Legal Events

Date Code Title Description
AS Assignment

Owner name: W H INDUSTRIES INC., P.O. BOX 155, NORTHVALE, NEW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MALHOTRA, SHASHI;REEL/FRAME:004451/0547

Effective date: 19850829

REMI Maintenance fee reminder mailed
SULP Surcharge for late payment
FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 19941005

AS Assignment

Owner name: DOCUMENTATION ON SUPPORT GROUP, NEW JERSEY

Free format text: SECURITY INTEREST;ASSIGNOR:WH INDUSTRIES, INC.;REEL/FRAME:008579/0759

Effective date: 19970626

AS Assignment

Owner name: FINOVA CAPITAL CORPORATION, CALIFORNIA

Free format text: SECURITY AGREEMENT;ASSIGNOR:WH INDUSTRIES INC.;REEL/FRAME:009893/0818

Effective date: 19990331

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362